Printing telegraph apparatus



w. J. ZENNER 2,555,622

PRINTING TELEGRAPH APPARATUS 3 Sheets-Sheet l INVENTOR WALTER J. ZENNER ATIORNEY June 5, 1951 Filed May 25, 1948 June 1951 w. J. ZENNER PRINTING TELEGRAPH APPARATUS 5 Sheets-Sheet 3 Filed May 25, 1948 INVENTOR WALTER J. ZENNER ATTORNEY Patented June 5, 1951 PRINTING TELEGRAPH APPARATUS Walter J. Zenner, Des Plaines, Ill., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application May 25, 1948, Serial No. 29,059

18 Claims. 1

This invention pertains to printing telegraph apparatus, and particularly to a type wheel printer.

The primary object of the present invention is to provide a telegraph recorder of compact construction wherein all of the functions incident to the printing of a character are completed within a single cycle of rotation of the operating and selecting shaft.

Another object of the invention is to provide a printer wherein the selection and printing of a character is performed within the same cycle.

The printer according to the present invention is of the class of printers shown in the W. J. Zenner Patent No. 2,279,609 issued April 14, 1942, wherein a ribbed drum, or cylinder, has been substituted by an assembly of stop discs rotatable as a unit and having teeth on their peripheries arranged to cooperate with a signal controlled escapement member. As distinguished from the structure according to the Zenner patent, the assembly of discs in the structure according to the present invention is movable longitudinally along with the shaft on which the type wheel is mounted, Whereas in the structure according to the Zenner patent, the cylinder is not movable. Furthermore, in the structure according to the present invention, the escapement member is given only a motion of oscillation instead of both rotation and translation as is the case in the structure according to said patent. Moreover, with the printer according to the present invention, a 2-row type wheel is provided, together with a novel shift mechanism controlled by the stop discs.

Briefly, the structure according to the present invention, includes a pair of motor driven shafts, one of which carries a type wheel and a group of toothed wheels or stop discs, and the other of which carries selecting and operating cams. A selector magnet, the armature of which is actuated cyclically by a selector cam and is held when the magnet is energized, by certain signal impulses, controls an eseapement member comprising a pair of pawl latches which straddle the group of stop discs in escapement fashion. The assembly or group of discs is movable along the supporting shaft while the escapement member is given only a motion of oscillation, as previously-mentioned. The stop elements on the discs are progressively doubled in number. Each group of stop elements lies in its individual plane. The individual fingers or projections on the periphery of the stop discs are placed equidistant with respect to each other, and the groups of stop fingers or elements are arranged in the order of one, two, four, eight, and sixteen teeth for controlling the position of the type wheel in accordance with signal impulses received by a selector magnet. These stop elements or teeth are assembled in relation to each other so that they will form 32 equidistant steps.

For a more complete understanding of the present invention reference may be had to the following detailed description, taken in connection with the accompanying drawings, in which,

Fig. l is a plan viewof the printing telegraph machine according to the present invention;

Fig. 2 is a sectional view taken substantially in line with 22 of Fig. 1;

Fig. 3 is a representation in exploded form of the stop discs according to the present invention;

Fig. 4 is a fragmental view disclosing the structure comprising the shift mechanism of the present printer;

Fig. 5 is a front elevational view, partially in section, of the printer according to the present invention; and

Fig. 6 is a fragmental plan view of a portion of the printer according to the present invention.

Referring now to the drawings and in particular to Fig. 1 thereof, reference numeral ll represents the base of a combined keyboard transmitter indicated generally by reference numeral l2 and a telegraph receiver I3. The keyboard transmitter I2 is preferably of the type forming the subject matter of the copending application for patent of W. J. Zenner, Serial No. 778,005, filed October 4, 1947, now Patent No. 2,534,494 of December 19, 1950, however, any of the well known keyboard transmitters can be used. It is the receiver 13 which forms the subject matter of this invention.

A standard electric motor 14, suitably secured to the base H, has a worm gear l6 secured to its shaft (not shown) which drives a gear H. The gear I! is secured to a shaft l8 which is journalled in a pair of brackets I9 and 2!. The gear 11 meshes with an idler gear 22 which is rotatably secured to the bracket 19, and the idler gear 22 meshes with a gear 23 secured to a hollow sleeve 24. A gear 26- secured to the shaft l8 supplies power to a transmitter mechanism 21 of the keyboard transmitter 12.

The shaft l8 carries a drive disc 28 which is urged suitably towards another cooperating drive disc 29, the disc 29 being fixed to the shaft l8 and the disc 28 being translatable thereon. Between the drive discs 28 and 29 there are the usual felt washers 3| which are in frictional engagement with a driven disc 52. When the driven disc 32 is held in a stopped position the drive discs 28 and 29 rotate relative thereto, however, when the driven disc 32 is released it is rotated with the drive discs due to the frictional engagement afforded by the felt washers 3i. A cam sleeve 33 is rotatable on the shaft 18 and carries an arm M which is adjustable rotatably relative to the cam sleeve and rests between a pair of lugs 55 on the driven disc 32, to afford a driving connection between the sleeve 33 and driven disc 52.

Referring to Fig. 2, a selector magnet 31 is rigidly secured to the base I I and has a cooperating armature 38 which is mounted pivotally on a shaft 39. The mechanism for releasing the cam sleeve 33 includes a lever 43 and a clutch trip off lever 42. The lever 4: is mounted pivotally on the shaft 39 and its pivotal movement is controlled by the armature 38. A spring 43, fastened at one end to a lug 44 on the lever M, is fastened at its other end to a lug 46 on an armature assist lever 41 and urges the lever 44 counterclockwise about its pivot shaft 39. The armature assist lever 41 is an integral part of the armature 38. An adjusting bolt 48 is provided for positioning the lever 4i relative to the armature 38. The clutch trip off lever 42 is mounted pivotally on a shaft 45 and has a shoulder 49 for cooperating with the arm 34 to block rotation of the driven disc 32 with the driving discs 28 and 29. A spring I urges the clutch trip off lever 42 counterclockwise towards an eccentric adjusting bolt 52 in order to align the shoulder 49 in the path of the arm 34. A foot 53 of the clutch trip ofi lever 42 cooperates with the lever 4! whereby clockwise movement of the clutch trip 01f lever 42 is blocked when the armature 38 is pulled up due to energization of the magnet 31. When the magnet 31 is de-energized a spring 54 moves the armature 3B clockwise (Fig. 2) to the dotted position 56 thereof which causes the lever 45 to be moved to its dotted position 51 at which time the arm 34 is permitted to pivot the clutch trip off lever 42 clockwise against the action of the spring 5|. The foot 53 on the clutch trip off lever 42 moves free of the lever 4! until the arm 34 overrides the shoulder 49 permitting the spring 5I to return the clutch trip oif lever 42 to its normal position.

1 The cam sleeve 33 has a plurality of cams rotatable therewith among which is an armature assist cam 58 which has a plurality of high portions 59 spaced around its periphery. A cam follower 6| on the armature assist lever 41 cooperates with the armature assist cam 58 to move the armature towards the selector magnet 31 immediately prior to the receipt of signal impulses by the magnet 31, which makes it possible to control the armature by much weaker signal impulses than is necessary when the armature must 1B and a holding pawl 11. The pawls 16 and 11 are mounted pivotally on the bolt 66 and are continuously urged towards one another by a sprin 13. The pawls 16 and 1? are fitted respectively with individual adjusting bolts 8! and 82 which cooperate respectively with the operating surfaces 13 and 14 on the lever 64. The timing between the armature assist cam 58 and the cam 52 is such that the high portions 59 of the armature assist cam 58 urge the armature assist lever 41 counterclockwise (Fig. 2) while the lever 64 is pivoted clockwise by the high portions of the cam 62. The follower 61 on the armature assist lever 41 drops to a low part of the armature assist cam 58 just prior to the presentation of the corresponding low part of the cam 62 to the follower 63. If the selector magnet 31 is not energized due to the receipt of a spacing signal impulse the armature 3B falls back due to the urging of the spring 55 to thereby move the lever 1| beneath the extended portion 69 which .prevents the follower 93 from dropping to theilow portion of the cam'52. If the selector magnet 31 is energized due to the receipt of a marking signal impulse the armature 38 is retained in its pulled up position and subsequently, when the follower I53 drops to one of the low parts of the cam 62, the extended portion 69 of the lever 64 is permitted to be urged downwardly behind the lever 1I.- The lever 54 is thereby pivoted counterclockwise to raise the pawls 16 and 11.

The hollow sleeve 24 is journalled in the bracket I9, and carried rotatably within the sleeve 24 is a shaft 86 which is longitudinally movable and robe pulled up entirely by the magnetic force of the V energized magnet.

A cam 52 cooperates with a follower 63 on a lever 64. The lever 64 is mounted pivotally on a bolt 66 secured to the bracket 2i and is held in spaced position thereon by a spacer sleeve 61. A spring 58 urges the lever 64 counterclockwise (Fig. 2) whereby the follower 53 is urged con-' tinuously towards the cam 62. An extended portion 69 of the lever 64 cooperates with the upper extremity of a lever 1! which is secured to the armature assist'lever 41 by bolts 12.

The lever 54 has a pair of operating surfaces .13 and 14 for controlling respectively a stop pawl tatable relative to the sleeve 24. A sleeve 81 is rotatable within a supporting journal 88 and the shaft 86 is slidable within the sleeve 81. The shaft is also journalled for rotational .and slidable movement inthe bracket 2|. The sleeve 24 carries a pair of friction discs 89 which form the drive member of a friction clutch 9|. The friction discs 89 are adapted to drive a disc 92 which is rotatable about the sleeve 24, thedriving connection between the drive discs 89 and the driven disc 92 being accomplished throughthe medium'of the usual felt. washers 93. The disc assembly is urged together by a compression spring 94 which abuts a nut 96 on the sleeve 24. The sleeve 81 carries a pair of arms 91 which engage notches in the periphery of the disc 92 to afford a means of driving the sleeve 81.

g The shaft 85 has a stop unit or projection assembly I8I rigidl secured thereto which consists of a plurality of toothed elements or ratchet members 592-4631, shown in detail in Fig. 3. An arm III secured to the sleeve 81 extends along the shaft 86 through the apertures H2 and H3 in the ratchet members I81 and I88 respectively and is adapted to impart rotation to the projection assembly I9I while the projection assembly IN is moved longitudinally with the shaft by means to be hereinafter described.

A shaft H2 is mounted securely in the bracket 2I. A member H3 is secured to a sleeve H4 which is slidable on the shaft H2. The opposite end of the member i I3 has a semicircular notch (not shown) with which the grooved portion of a collar I I5 cooperates. The collar 1 Iii is secured to the shaft 56 and has a ratchet M1 on one side thereof. A bell crank I28 having a pawl (not shown) is urged continuously into cooperation with the ratchet ill by a spring 525 and prevents any backward bounce of the projection assembly ISI when it is stopped.

The lower depending portion (not shown) of projection assembly While the projection assembly IOI is rotating in 4 the member H3 is bent in the form of a U to receive a knobbed portion II8 (Fig. 6) of a lever II9 which is pivoted on the bolt I 2|. A member I22 is also pivoted on .the bolt I2I and has a .cam follower I23 which, by means of a spring I26, is held continuously in contact with a cam I24 secured to and rotatable with the cam sleeve 33. An upturned portion of the lever H9 is fastened to aspring l2i which is fastened at its other end to the member I22, the lever I I9 thereby being maintained in contact with an adjusting eccentric I28 continuously. By the use of the spring I21 there is provided a yield for the lever II9, so that if for any. reason longitudinal movement of the shaft 86 is restrained, the spring I21 will yield. As the cam I24 rotates with the cam sleeve 33, the shaft 86 and the various mechanisms attached thereto are moved longitudinally as the lever II9 pivots about the bolt I2I.

When the circuit through the selector magnet 3! is closed, but at a time when no signals are being received, the magnet 3! is energized continuously. At this time the sleeve 33 is prevented from rotating due to th blocking of the clutch trip off lever 62 by the lever 4|. Also at this time the shaft 83 and projection assembly Iill are in the positions thereof as shown in Fig. 6. Rotation of the projection assembly IDI is prevented due to the engagement. of the ratchet member I 02 with the stop pawl I6. When a signal is received the first impulse is a start or spacing impulse which causes the selector magnet 31 to be de-energized momentarily which in turn permits the armature 38 and lever M to pivot clockwise (Fig. 2) thereby releasing the cam sleeve 33 for rotation. Assuming that the first signal impulse of the incoming signal is a marking (current) impulse, the lever 04 pivots counterclockwise (Fig. 2), the extended portion 69 dropping behind the lever II. Asthe lever 64 pivots in this manner the pawl I6 is raised, which releases the ratchet member I02 from engagement with the pawl I6 to thereby permit the drive discs 89 to impart rotary motionto the driven disc 92 which in turn cause the projection assembly to rotate. As the pawl It is raised the pawl I? is likewise raised into the path of the rotating i ratchet member I82. to momentarily stop the rotation of the projection assembly II. Thereafter as the follower G3 on the lever 64 is raised by the next subsequent high portion on the cam 62, the lever B l is pivoted to cause the pawl 11 to release the ratchet member I02 30 that the IOI continues to rotate.

this manner the cam I24 rotates with the cam sleeve 33 and because of this, by the time the lever 64 is raised to allow the pawl TI to release ber I03 engages the stop pawl It. As the lever v 54 is pivoted in response to the next marking impulse of the incoming signal the projection assembly rotates a quarter revolution from the point of disengagement of the pawl I6 from the ratchet member I03 until the pawl 11 engages one of the projections on the ratchet member I04. The rotational distance the projection assembly IOI travels when the pawls IE and II are pivoted due to the receipt of marking impulses is one eighth of a revolution when the ratchet member I04 is released, one sixteenth of a revolution when the ratchet member I05 is released, and one thirty-second of a revolution when the ratchet member I06 is released. Remembering that a spacing impulse prevents rotation of the projection assembly IIlI due to the fact that the pawl I6 does not release the projection it engages at that time, it is readily apparent thatthe projection assembly IBI may be rotated to any one of thirty-two positions when the five marking or spacing impulses are permuted in all possible combinations.

The pawl 11 is urged towards engagement with the projection assembly IOI each time the pawl I6 releases the projection assembly IOI for rotation. The function of the pawl I1 is to engage one of the teeth on the projection assembly to stop the rotation of the assembly momentarily to prevent the projection, on the ratchet member immediately subsequent to the ratchet member which has just been released, from overriding or rotating to the point where it cannot be engaged by the pawl II. Due to the fact that the normal amount of rotation of the projection assembly I M must be suflicient to rotate the projection assembly a half revolution during the first signalimpulse interval and a quarter revolution during the second impulse interval, it is apparent that several of the projections on the ratchet members I06 and I01 would rotate beyond the stop pawl I6 if it were not for the action of the pawl I I in preventing it.

In the operation of this receiver there is necessarily some slippage between the clutch discs 92 and 93 so that there is not an instantaneous rotation of the projection assembly IOI when it is released bythe stop pawl It. Th ratio of the diameters of the gears I1 and 23 is roughly three and one-half to one. The shaft I8 and consequently the cam 52 makes one revolution during a complete signal and approximately one seventh of a revolution during the receiptof a single impulse of a signal. Assuming that the first signal impulse is a marking signal, it is necessary that the projection assembly complete at least a half revolution after the ratchet member I02 is released by the pawl Hi. If the projection assembly IOI is not rotated sufficiently and if the second signal impulse is marking, the projection on the ratchet member I02 is engaged by the pawl H which is pivoted counterclockwise in response to the second marking signal and therefore the projection on the ratchet member I03 is stopped by the pawl I6 when the pawl lI releases the ratchet member I02. Under these conditions the projection assembly IOI rotates only half a revolution instead of three quarters of a revolution in response to the first two marking impulses of the signal. Therefore provision is made to overcome this undesirable result due to the slippage referred to above.

The pawl TI is provided with an extended arm I3! having an upturned foot I32 thereon. A spiral cam arm or deflector I33 is secured to the shaft 86 and is rotatable therewith. Th spiral cam arm or deflector I33 is adapted to cooperate with the foot I32 in order to cam the pawl I! from engagement with the projection assembly. When there is slippage between the discs 93 and 92 the projection assembly may not commence signal, it will have moved transversely or longitudinally with the shaft 66 due to the continuous rotation of the cam I24. When the projection assembly IIII has moved in this manner the defiector I33 engages the foot I32 to cam the pawl 11 from engagement with an of the projections on the projection assembly I6 I and because of this the ratchet member I62 is not stopped by the pawl 11 when released as a result of the second marking impulse. The deflector I33 releases the foot I32 when the projection on the ratchet member I62 passes the pawl 11. As the high part of the cam 62 corresponding to the third signal impulse causes the pawl 16 to be moved to its lower or blocking position the projection on the ratchet I64 engages the stop pawl 16. Therefore the projection assembly lIiI will have moved three quarters of a revolution even though there is slippage between the clutch discs 93 and 92.

A type wheel I36 is secured to a sleeve I31 which is mounted on the shaft 66 and movable longitudinally thereon. The sleeve I31 is also rotatable on the shaft 86 but only for purposes of adjusting rotatably the type wheel I36. A plate I38, secured to the shaft 66, is adjustable rotatably thereon and has an arm I39 which extends through an aperture MI in the type Wheel I36. A second plate I62 is rigidly secured to the shaft 66 by a nut I63 and has apair of circular slots I44 therein. A pair of bolts I46 extends through the slots I66 into a pair of screw threaded apertures (not shown) in the plate I38 to facilitate rotary adjustment of the type wheel I36. The arm I39 has a compression spring I60 suitably secured thereto which abuts a washer I45 to urge the type wheel I36 longitudinally along the shaft 66.

Mounted slidably and rotatably on the shaft I I2 is a bracket I61 which carries a felt roller I48 for holding a supply of ink and a rubber inking roller I49 which engages the type wheel I36 to maintain the type Wheel I36 in a printing condition. The bracket I41 has an arm I! which rides in a slot I52 in a collar I53 on the sleeve I31 to maintain the rollers I48 and I49 in alignment with the type wheel I36. The arm I5I is maintained within the slot I52 by a spring I54.

In order to permit the receiver comprising this invention to be used on circuits employing page printers and also to increase the number of characters which can be printed the receiver is provided with a shift mechanism which is capable of controlling the longitudinal positionment of the type wheel I36 relative to the shaft 66. The type wheel I36 has two rows of characters and, when in printing position, occupies the unshift position when it assumes the solid line position shown in Fig. 4 and is in the shift position when occupying dotted position I56 as is also shown in Fig. 4. The shift and unshift mechanism is shown in Figs. 4 and 6. A bracket I51 is secured to the bracket 2!. A shift and unshift lever I6I is mounted pivotally on the bracket I51 by a bolt I62 and is urged in a clockwise direction by a spring I63. The shift and unshift lever I6l has an arm I64 havin a latch or foot I66 thereon and. is movable to either the solid line position thereof as shown or the dotted position I61 as shown in Fig. 4. The shift and-unshift'lever I6I also has an .arm I68 having an upturned foot I69 which cooperates with a shoulder. I12 on a bell crank lever IN. The bell crank lever [H is mounted pivotally on a bolt I13 and is adjustable by means of an eccentric I14. The bell crank lever Ill is-biased clockwise about the bolt I13 by a spring I16 suitably secured to the bracket I51. The foot I66 on the arm I64 cooperates with the collar I53 to control the longitudinal positionment of the type wheel I36 on the shaft 86 in a manner such that as the shaft 86 is moved to bring the type wheel I36 into printing position due to the action of the cam I24, the foot I66 engages the collar I53 and holds the type wheel I36 in unshift position against the action of the spring I66 when the arm I64 is in its solid line position (Fig. 4). When the arm I64 is in its dotted line position (Fig. 4) the spring I46 is permitted to expand whereby the type wheel I3 6 moves to unshift position as represented by the dotted positionI56 when the shaft 66 is moved'to printing position. When the type wheel I36 is in shift position a first row of type faces is in printing position and when the type wheel is in unshift position a second row of type faces is in printing position. r

A U-shaped bracket III is secured suitably to the bracket 2i and carries a pair of longitudinally slidable pins I18 and I19, the pin I1 8 being the unshift pin and the pin I19 being the shift pin. It is apparent that when the shift pin I 19 is moved forward it engages the shift and unshift lever I6! to pivot it against the action of the spring I63 thereby moving the arm I64 to its dotted position I61 (Fig. 4) or .shift position. When the lever I6I is moved in this manner the foot I69 is moved counterclockwise which permit the spring I'I6 to pivot the bell crank I 1| clockwise so that the shoulder I12 latches the foot I69 thereby retaining the shift and unshift lever I6I in its shift position. When the shift and unshift lever.I6I is in its shift'position a forward movement of the unshift pin I16 causes it to engage and pivot the bell crank I1I against the action of the spring I16 thereby releasing the shoulder I12 from latching engagement with the foot I69 which permits the spring I63 to move the shift and unshift lever I6I to its unshift position.

When an unshift or letters signal, consisting of five marking impulses, is received by the selector magnet 31, the projection assembly I6I is rotated in response thereto through thirty-one of its thirty-two different stop positions and also is advanced longitudinally, carrying with it the type wheel I36, toprintingposition. Whentheprojection assembly I6! is moved in this manner the projection on the ratchet member I92 is aligned with and engages the unshift pin I18 to move it forward which in turn results in the retentionof the type wheel I36 in unshift position. When a shift or figures signal, which consists of all marking impulses except number three which is a spacing impulse, the projection assembly IIlI is rotated through twenty-seven of its thirty-two different stop positions which brings the projection on the ratchet member I92 into alignment with the shift pin I18. The longitudinal movement of the projection assembly IIII, due to the action of the cam I24, then causes the shift pin I19 to be moved forward to permit the spring I46 to 9, move the type wheel I36 to shift position as represented by the numeral I56 (Fig. i)

A print hammer cam I8I is secured to the cam sleeve 33 and is rotatable therewith. A member I82, mounted pivotally on a bolt I83, has a fol-- lower I84 which rides the cam I8I continuously due to the urging of a spring I 89 suitabl secured to the receiver frame. A print hammer lever I8? is mounted pivotally on the bolt I83 and has a print hammer I88 secured thereto which cooperates with the type wheel I36 to print the selected character on a tape (not shown) carried by a tape chute I89. The tape chute I89 has a suitable aperture I90 which permits the print hammer I88 to force the tape against the type wheel I36. The member I82 carries an adjusting screw I9I for adjusting the position of the print hammer lever I8'I relative thereto. The print hammer lever I81 yieldably follows the pivotal movement of the member I82 and is held normally against the adjusting screw I9I by a tension spring I92 secured to the member I82. Where the cam sleeve 33 is released for rotation the cam I8I urges the follower I84 slowly to the left (Fig. 5) which takes place while the position of the type Wheel I36 is being determined according to the signal received by the selector magnet 31. When the type wheel I39 is ultimately positioned, the cam IBI continues to advance until the follower I84 drops to the low part of the cam I8I, whereupon the spring I86 contracts to move the member I82 clockwise which raises the print hammer lever I81 until the print hammer strikes the tape to move it against the type wheel I36 in order to print the selected character thereon.

Means is also provided for advancing the tape in the tape chute I89 in order to produce a space between the characters printed on the tape. A bolt I99 is secured to the bracket 2| and supports a sleeve I94 which is rotatable freely therearound. A tape feed wheel I96 at one end of the sleeve I94 and having serrations on its periphery suitable for frictionally engaging the tape, is positioned directly above the tape chute A-ratchet wheel I9! is affixed to the other end of the sleeve I94 for imparting rotation to the tape feed wheel I96. A pawl I98 which cooperates with the ratchet wheel I9! to impart rotation thereto i's'sec'ured pivotally to an upstanding portion I99 of the member I82 by means of a bolt 29L A spring 292 urges the pawl I98 clockwise about the bolt 29I to thereby maintain the pawl I98 and the i atchet wheel I91 in continuous engagement. When the member I82 is pivoted counterclock- Wise due to the action of the cam I8I cooperating with the follower I84 the pawl I93 is moved to the left (Fig. 5) to advance the ratchet wheel manually against the urging of the spring 258,

causes the roller 2% to be withdrawn downward- 1y thus permitting the manual feeding of tape through the tape chute I89.

Having thus described the apparatus embodied in'the invention it is felt that a brief description of the sequence of operations of the receiver will be helpful for a more complete understanding of the invention.

Incoming signals are received by the selector magnet 31 which, when de-energized by the incoming start signal, permits rotation of the sleeve 33. The receipt of the subsequent permutation of five marking and spacing signals controls the escapement mechanism, comprising the lever 64 and pawls I9 and TI. The cam I24, which rotates with the sleeve 33 and causes the longitudinal advancement of the projection assembly IIlI, cooperates with the escapement mechanism to control the rotational movement of the projection assembly in accordance with the signal received by the selector magnet 37. The rotational movement of the projection assembly Ifll causes the type wheel I39 to be moved to the corresponding position and the longitudinal movement of the projection assembly IIII results in a movement of the type wheel i 99 to printing position. At the same time that the type wheel I36 is being positioned selectively the tape is being advanced to provide a space between the characters printed thereon. Thereafter the follower I84 slips off the high part of the cam I8I permitting the print hammer I88 to strike the tape and move it against the character selected on the type wheel I36. Very shortly thereafter the following I23 slips off the high portion of the cam I24 thereby permitting the spring I26 to return the projection assembly IBI and type wheel I36 longitudinally to inoperative position. The continuously rotating clutch disc 92 then imparts the necessary rotation to the sleeve 8'! to return the projection assembly IIlI to its stop position with the projection on the ratchet member I92 against the stop pawl Hi. The apparatus is then in condition for the receipt of another signal by the selector magnet 31.

It is to be expressly understood that various changes and modifications may be made in the invention without departing from the spirit or scope thereof.

What is claimed is:

1. In a selector, a shaft rotatably and translat ably movable to any one of a plurality of character stop positions, means for rotating said shaft, a projection assembly comprising a plurality of toothed members carried by said shaft, escapement means cooperating with said projection assembly for arresting rotational movement of said shaft, and means for imparting translational movement to said shaft to thereby permit said escapement mean to engage successive ones of said toothed members to determine the stop position. of said shaft.

2. In a selector, a shaft rotatably and. translatably movable to any one of a plurality of character stop positions, means for rotating said shaft, a projection assembly carried by said shaft, said projection assembly comprising a plurality of toothed members arranged successively along said shaft, an escapement mechanism cooperating with said projection assembly for arresting rotational movement of said shaft, and means for imparting translational movement to said shaft whereby said escapement mechanism cooperates with successive ones of said toothed members to determine the stop position of said shaft.

3. In a telegraph receiver, rotatable type wheel provided with a plurality of characters, means having a series of elements thereon arranged in a plurality of planes for controlling the rotation of said type wheel, means for imparting rotational and translational movements to said means.

4. In a telegraph printer, a rotatable and translatable shaft, a type wheel carried by said shaft and movable therewith, means carried by said shaft having a plurality of rows of projections thereon, an escapement mechanism responsive to signal impulses for cooperating with said projections to control the rotation of said shaft, and means for effecting translational movement of said shaft to permit said escapementmechan ism to cooperate with successive row of said projections, said type wheel thereby being positioned in accordance with the signal impulses.

5. In a permutation code printing telegraph receiver, printing means, stop means for positioning said printing means comprising a series of rows of stops, the number of stops of each row being progressively doubled with respect to the preceding row, one row of stops being provided for each unit of a permutation code by which the 7 receiver is to be controlled, an escapement member cooperable with said rows of stops, means to set said escapement member in accordance with said received signals, and means for imparting rotational and translational movements to said stop means to thereby bring successive rows of said stops into cooperation with said escapement member in order to position said printing means in accordance with the received signals.

tain of said toothed elements to operate said'shift means.

9. In a telegraph receiver, a case shift means, a signal responsive escapement mechanism, a rotatable and translatable projection assembly having a plurality of rows of teeth, means for rotating said projection assembly, means for imparting motion of translation to said projection assembly to enable successive rows of teeth to cooperate with said escapement mechanism to ultimately position said. projection assembly, and

, means under the direct control of said projection 6. In a selector, a shaft rotatably and translatably movable to any one of a plurality of character stop positiOns, a type wheel on said shaft and movable therewith, means for rotating said shaft, a projection assembly carried by said shaft, said projection assembly comprising a plurality of toothed members arranged successively along said'shaft, the teeth of each member being progressively doubled with respect to the preceding member, a signal controlled escapement mechanism for controlling rotation of said projection assembly, and means for imparting translatory motion to said shaft to cause successive toothed members to cooperate with said escapement ..mechanism to thereby position said type wheel in accordance with signals controlling said escapement mechanism.

7. In a recorder, a rotatable shaft, means carried by said shaft having projections thereon, said means capable of rotational and translational movements, signal responsive means cooperable with said projections for effecting rotation of said first recited means, cam means for effecting translation of said first recited means cooperating with said signal responsive means to govern the ultimate position of said shaft and the projections, shift means, and means under the direct assembly when ultimately positioned for operating said case shift means.

10. In a telegraph receiver, a case shift means, a rotatable projection assembly, means for imparting rotation to said projection assembly, a signal responsive escapement mechanism for controlling the rotation of said projection assembly, means for imparting translatory motion to said projection assembly cooperating with said escapement mechanism to ultimately position said projection assembly, and a pair of pins associated with said case shift means under the direct control of said projection assembly when ultimately positioned for operating said case shift means.

11. In a telegraph printer, a type wheel positionabl-e in either of two translatory positions, a rotatable stop unit, means for rotating said stop unit, a signal responsive means for controlling the a rotation of said stop unit, said signal responsive means further determining the ultimate position of said stop unit, and means directly controlled by said stop unit and rendered operable upon the ultimate positionment thereof in predetermined positions for positioning said type wheel in one of its two translatory positions.

12. In a telegraph. receiver, a rotatable type wheel comprising a plurality of rows of type faces, means for moving said type wheel translatably to any one of a plurality of positions whereby each of said plurality of rows of type faces may be rendered effective, means for controlling said type Wheel moving means, a rotatable projection assembly, means for imparting rotation to said projection assembly, a signal responsive mechanism for controllin the rotation of said projection assembly, means for imparting translatory motion to said projection assembly cooperating with said signal responsive mechanism to ultimately position said projection assembly, and means under the direct control of said projection assembly when ultimately positioned for operating said means for controlling said type wheel moving means.

13. In a selector, a rotatable shaft arrestable in any one of a plurality of character stop positions, a stop unit carried by said shaft comprising a plurality of toothed elements, clutch means for imparting rotation to said shaft and stop unit, a signal responsive escapement mechanism for cooperating with said stop unit to arrest the rotational movement of said shaft, means for imparting translational movement to said shaft cooperating with said escapement mechanism to determine the stop position of said shaft, said clutch means tending to slip up to a predetermined amount upon initial operation, and means secured to said shaft rendered operable upon slippage of said clutch means for engaging said escapement mechanism to prevent said arrest of said shaft and to thereby enable said shaft to rotate an amount commensurate with said slippage of said clutch means. v

14. In a signal controlled selector, a rotatable shaft, a projection assembly carried by said shaft, means for imparting rotation to said shaft, a signal controlled escapement mechanism cooperating with said projection assembly, means for imparting translational movement to said shaft cooperating with said escapement mechanism to determine a stop position of said shaft in accordance with signals controlling said escapement mechansim, said rotation imparting means tending to slip up to a predetermined amount upon initial operation, and means secured to said shaft rendered operable upon slippage of said rotation imparting means to engage said escapement mechanism to prevent stopping of rotation of said shaft by said escapement mechanism to thereby enable said shaft to rotate an amount commensurate with said slippage of said rotation imparting means.

15. In a signal controlled selector, a rotatable shaft, a projection assembly carried by said shaft, means for imparting rotation to said shaft, a signal controlled mechanism having a stop pawl and a holding pawl thereon for cooperating with said projection assembly to control the rotation of said shaft in accordance with a controlling signal, means for translatably moving said shaft cooperating with said signal controlled mechanism to determine a stop position of said shaft in accordance with the controlling signal, said rotation imparting means tending to slip up to a predetermined amount upon initial operation, and a deflector secured to said shaft rendered operable upon slippage of said rotation imparting means for deflecting said holding pawl from said projection assembly and thereby preventing stopping of rotation of said shaft by said holding pawl to thereby enable said shaft to rotate an amount commensurate with said slippage of said rotation imparting means.

16. In a signal controlled selector, a rotatable shaft, a projection assembly carried by said shaft, means for imparting rotation to said shaft, a signal controlled escapement mechanism for cooperating with said projection assembly to control the rotation of said shaft in accordance with a controlling signal, means for translatably moving said shaft cooperating with said escapement mechanism to determine a. stop position of said shaft in accordance with the controlling signal, said rotation impartin means tending to slip up to a predetermined amount upon initial operation, and means secured to said shaft rendered operable upon slippage of said rotation imparting means for engaging and thereby momentarily suspending the operation of said escapement mechanism to thereby enable said shaft to rotate an amount commensurate with said slippage of said rotation imparting means.

17. In a signal controlled selector, a rotatable shaft, a projection assembly carried by said shaft, means for imparting rotation to said shaft, a signal controlled escapement mechanism for cooperating with said projection assembly to control the rotation of said shaft, means for translatably moving said shaft cooperating with said escapement mechanism to determine a stop position of said shaft, said rotation imparting means tending to slip up to a predetermined amount upon initial operation thereby failing to immediately rotate said shaft, and a deflector secured to said shaft operative upon failure of said rotation imparting means to immediately rotate said shaft for engaging and momentarily suspending the operation of said escapement mechanism to thereby enable said shaft to rotate an amount commensurate with the slippage of said shaft upon the failure of said rotation imparting means to immediately rotate said shaft.

18. In a telegraph printer, a rotatable shaft. a stop unit on said shaft comprising a plurality of ratchet members, means for rotating said shaft, a signal controlled escapement mechanism cooperable with said stop unit, cam means for moving said shaft translatably to thereby move successive ones of said ratchet members into operative engagement with said escapement mechanism in timed relation with signal impulses controlling said escapement mechanism, whereby said escapement mechanism controls the rotation of said shaft, said shaft rotating means tending to slip up to a predetermined amount upon initial operation, and a deflector carried by said shaft for engaging said escapement mechanism between successive signal impulses and effective upon slippage of said shaft rotating means to suspend operation of said escapement mechanism to enable said shaft to rotate an amount commensurate with said slippage of said shaft rotating means.

WALTER J. ZENNER.

REFERENCES CITED The following references are of record in the Y file of this patent:

UNITED STATES PATENTS 

